diff --git a/src/frontend/src/App.tsx b/src/frontend/src/App.tsx
index be27815..18d6567 100644
--- a/src/frontend/src/App.tsx
+++ b/src/frontend/src/App.tsx
@@ -196,9 +196,9 @@ function CreateTaskModal({ onClose, onSubmit }: {
 
         {/* Title */}
         <div style={{ marginBottom: 12 }}>
-          <label style={{ fontSize: 11, color: 'var(--muted)', marginBottom: 4, display: 'block' }}>标题（可选）</label>
+          <label style={{ fontSize: 11, color: 'var(--muted)', marginBottom: 4, display: 'block' }}>标题（可选，不填将自动生成）</label>
           <input value={title} onChange={(e) => setTitle(e.target.value)}
-            placeholder="简要概括任务..."
+            placeholder="简要概括任务，不填自动从描述生成..."
             style={{ width: '100%', padding: '8px 12px', borderRadius: 6, border: '1px solid var(--line)', background: 'var(--panel)', color: 'var(--fg)', fontSize: 13 }} />
         </div>
 
diff --git a/src/frontend/src/api.ts b/src/frontend/src/api.ts
index d40b62e..06eaedd 100644
--- a/src/frontend/src/api.ts
+++ b/src/frontend/src/api.ts
@@ -222,14 +222,16 @@ export const api = {
       const pid = _currentProjectId || Object.keys((await api.projects()).projects)[0];
       if (!pid) return { ok: false, error: 'No project selected' };
       const prio = typeof data.priority === 'string' ? parseInt(data.priority, 10) || 5 : 5;
-      return postJ(`${API_BASE}/api/projects/${pid}/tasks`, {
+      // title 为空时不传，后端自动生成（description 前30字 + …）
+      const payload: any = {
         id: `task-${Date.now().toString(36)}`,
-        title: data.title || data.requirement || '',
         description: data.requirement || data.title || '',
         task_type: data.project_type || 'general',
         priority: prio,
         assigned_by: 'user',
-      });
+      };
+      if (data.title && data.title.trim()) payload.title = data.title.trim();
+      return postJ(`${API_BASE}/api/projects/${pid}/tasks`, payload);
     } catch (e: any) {
       return { ok: false, error: e.message };
     }